Flight Time from Decatur to St. Louis
The flight from Decatur to St. Louis covers about 107 mi and takes roughly 42 min nonstop. Flight duration estimate and fare guide.
Decatur and St. Louis are about 107 mi (172 km) apart in a straight line. By road that works out to roughly 139 mi (224 km), a drive of about 2 hr 29 min. A nonstop flight covers the great-circle distance in approximately 42 min.
| Straight-line distance | 107 mi / 172 km |
| Road distance (est.) | 139 mi / 224 km |
| Driving time (est.) | 2 hr 29 min |
| Nonstop flight (est.) | 42 min |
| Driving fuel (est., 1-way) | $17 |
| Typical flight fare | $80–$250 |
| Geographic midpoint | 39.235, -89.582 |
How these estimates work
Straight-line distance uses the haversine formula on each city's coordinates. Road distance applies a circuity factor (~1.2–1.4×) and driving time a blended average speed. Flight time uses typical jet cruise speed plus ~30 minutes for taxi, climb and descent. Treat all figures as planning estimates.
Frequently asked questions
Decatur to St. Louis is about 107 mi (172 km) in a straight line, and roughly 139 mi (224 km) by road.